Year	current US$
1999	55000000
2000	66000000
2001	71000000
2002	71000000
2003	37000000
2004	33000000
2005	32000000
2006	33000000
2007	40000000
2008	44000000
2009	28000000
2010	29000000
2011	37000000
2012	36000000
2013	20000000
2014	19000000
2015	15000000
2016	9000000
2017	41000000
2018	48000000
2019	47000000
2020	14000000